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Netpeak Spider vs Seodisias: catalog facts
Netpeak Spider	Seodisias
Paid Commercial software with a free trial.	Free The developer says the core crawler and analysis features are free.
Windows, macOS	Windows, macOS, Linux
Dedicated crawler for technical SEO audits Runs as a desktop application	Checks for more than 30 technical issues Can render JavaScript-heavy pages
Paid after the trial Closed source	Windows and Linux builds are not code-signed
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.